Why have they selected your appointment for this purpose of forgery??
You are not manager HR,you are not purchase officer?
What reason could be there in making you a scapegoat?
This needs to be discussed with a legal consultant for legal actions before they land you into problems.
12th February 2016 From India, Pune
After taking legal opinion/inputs write to the management about the whole issue.
Keep facts documented and also sent to appropriate authorities under acknowledgment.
Your documenting these facts will keep your side legally safe.
15th February 2016 From India, Pune